Reflection Impedance

P 182 REFLECTION IMPEDANCE Summary Lúcio T. Santos Martin Tygel and Antonio C.B. Ramos DMA – IMECC – UNICAMP and PETROBRAS AVO is now an established technology and has been widely deployed as a lithology indicator and also as a direct hydrocarbon indicator. Reservoir characterization studies make use not only of traditional AVO attributes but also impedance volumes. The near-offset or the intercept stack volume offers a natural way of obtaining acoustic impedance volume through the use of post-stack inversion algorithms. However to invert far-stack volume one needs an approach capable of estimating impedances for a variable incidence angle. This